JPS6364714A - Ejection equipment for molded product in molding machine - Google Patents

Abstract

PURPOSE:To constitute the title equipment so that connection between an ejector pin on a mold side and an ejection device on a mold clamping side is performed simply and safely, by a method wherein the title equipment is constituted of the ejector pin disposed in a mold, an ejector rod pierced through movably within a mold clamping board and a driving device on a mold clamping board side performing advance and retreat movement of the ejector rod. CONSTITUTION:A mold 2 is provided therein with an ejector pin 4 so that it may freely go in and out for a molded product 3. An ejector rod 7 is situated at a through hole 19 of the inside of a mold clamping board 1 bores in a position corresponding to a holding recessed part 18 of the ejector pin of the mold 2 due to fitting of a hydraulic cylinder 13 to the mold clamping board 1. Although an ejector piston 9 is separated from the ejector pin 4 when the ejector piston 9 is situated at a backward movement position against a spring member 14, and when the ejector piston 9 is moved forward, the ejector piston 9 is ejected into a recessed part 18 of the mold through the through hole 19. When hydraulic pressure in a fitting cylinder is removed, a coupler 11 is pressed outward by a locking piston 10 by moving the locking piston 10 forward by spring pressure. With this construction, the coupler 11 is fitted in an annular groove 5 and the ejector pin 4 and ejector rod 7 are joined together integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a molded product ejecting device for ejecting and releasing a molded product from a molding die.

(Prior art) Generally, in this type of molded product ejecting device, an ejecting pin provided in the mold is advanced by an ejecting rod protruding from the mold clamping plate side, and a return pin or return spring provided in the mold is advanced by a protruding rod protruding from the mold clamping plate side. Returned by

However, if a return pin or return spring is not provided due to the structure of the mold, if the ejector pin is operated at high speed to increase the cycle, or if you want to return the ejector pin reliably to protect the mold, A projecting pin in a mold is connected to a projecting rod, and the projecting pin is forcibly moved forward and backward by moving the projecting rod back and forth.

In such a case, the connection method is to attach the mold to the movable platen, move it forward with a protruding rod, and screw it in using a spanner or the like through the working hole on the side of the mold, or to connect the mold with the protruding rod. The method is to protrude from the back side, assemble it to the molding clamp, and then screw it to the protruding plate from the back of the mold clamping machine.

(Problems to be Solved by the Invention) However, with the above-mentioned conventional method, the work is difficult and time-consuming because the work space is narrow, and it is difficult to ensure sufficient safety when building the shelves. Ta.

This invention was made in view of the above circumstances, and
It is an object of the present invention to provide a molded product ejecting device that can easily and safely connect an ejecting pin on the mold side and an ejecting means on the mold clamping side.

(Means for Solving the Problems) This invention according to the above object includes a protruding pin built into a mold, a protruding rod movably inserted into a mold clamping plate, and a mold clamping member that moves the protruding rod forward and backward. The protruding pin and the protruding rod are arranged in an annular groove formed on the inner circumferential side of the socket in the rear part of the protruding pin and in a membrane island mouth, and the protruding pin and the protruding rod can freely protrude and retract from the annular groove formed on the inner peripheral side of the socket and the tip side of the protruding rod. The connector is integrally connected by engagement with the provided connector, and the connector is engaged and detached using a locking member that is movable in the axial direction and is built into the protruding rod, thereby solving the above-mentioned conventional problems. .

(Function) In this invention, after the mold is attached to the mold clamping board, the protruding rod is moved forward to fit the tip into the connecting part at the rear end of the protruding pin, and then the connector is inserted into the annular groove by the lock piston. When inserted, the ejecting pin and ejecting piston are integrally connected by the connector, and unless the lock piston is retreated and removed, the ejecting pin moves forward and backward together with the ejecting piston to eject the molded product.

(Example) In the figure, 1 is a mold clamping plate of an injection molding machine, and 2 is a mold.Although omitted in the drawing, it is paired with a mold on the fixed plate side installed opposite the mold clamping plate 1, and is formed by closing the mold. The molded article 3 is molded by filling the molded cavity with molten resin.

The mold 2 is equipped with a protruding pin 4 for the molded product 3 so as to be able to move in and out. The rear end of the protruding pin 4 is a cylindrical socket 6 which has a larger diameter than the protruding pin 4 and has an annular groove 5 on the inner circumferential side. The protruding pin 4 protrudes outward from the mold surface of the mold 2 until the stepped portion comes into contact with the inner wall of the mold 2.

A projecting rod 7 is integrally formed at the tip of a projecting piston 9 of a hydraulic cylinder 8 for driving the projecting. The protruding opening rad 7 and the protruding piston 9 are hollow, and a lock piston 10 is inserted therein.

The outer diameter of the tip 7a of the protruding rod 7 is formed to be slightly smaller than the inner diameter of the socket 6, and a connector 11 made of a plurality of steel balls that fits into the annular groove 5 is provided on the side of the tip. It is provided so that it can be loosely fitted into the hole 12 and can come out and go out.

The protruding piston 9 passes through the hydraulic cylinder 8, and is formed in the cylinder 13 of the lock piston 10.
is pressed until its tip is located at the tip of the protruding rod. Further, the engagement cylinder 13 is provided with a hydraulic path 15 for moving the lock mechanism 10 backward against the spring member 14.

16 is a cylindrical cover member that covers the tip of the protruding rod 7, and is fitted around the protruding rod 7 so as to be freely movable in the axial direction. It is pressed forward by a spring member 17 provided between the protruding piston 9 and one end surface of the cover, thereby covering the tip of the protruding rod and preventing the connector 5 from falling off.

The protruding rod 7 is located in a through hole 19 in the mold clamping disc that is bored at a position corresponding to the ejecting pin storage recess 18 of the mold 2 by installing the hydraulic cylinder 13 to the mold clamping disc 1. When the protruding piston 9 is in the backward position against the spring member 14, it is separated from the protruding pin 4, as shown in FIG. The mold recess 18 is protruded from the mold recess 18 .

Due to this protrusion of the protruding rod 7, the protruding pin 4 also extends into the socket 6.
moves until it comes into contact with the inner wall of the mold, and after stopping the movement, the protruding rod tip 7a fits into the socket 6.

At this time, the cover member 16 is pushed back by the open end of the socket 6 to expose the connector IJ.

When the connector 11 is located in the annular groove 5, the hydraulic pressure in the engagement cylinder 13 is removed (and the lock piston 10 moves forward due to spring pressure to press the connector 11 outward. The connector 11 engages with the annular groove 5, and the protruding pin 4 and the protruding rod 7 are integrally coupled (see FIG. 3).

The engagement between the annular groove 5 and the connector 11 is maintained unless the lock piston 10 is forcibly retreated and removed, and moves forward and backward each time the hydraulic cylinder 8 is operated to prevent the molded product 3 from protruding. conduct. Therefore, when it becomes necessary to release the annular groove 5 and the connector 11 to release the coupling, it is sufficient to supply hydraulic pressure to the engagement cylinder 13 to return the lock piston 10 to its original position.

In the above embodiment, steel balls were used as the connectors r and t, but other types of connectors ri may be used, and the protruding rod 7
When the cover member 16 is fixed to the tip 7 of the cover member 16, the cover member 16 is not required.

Furthermore, although the movement of the protruding rod and lock piston is performed by hydraulic pressure, it is also possible to use air pressure or the rotational force of an electric motor converted into reciprocating movement using a pole screw or the like.

(Effects of the Invention) As described above, this invention includes a protruding pin housed in the mold and a protruding rod movably inserted into the mold clamping plate.
As the ejecting rod moves forward, the ejecting pin is integrally connected inside the socket at the rear of the ejecting pin, so simply by moving the ejecting rod forward after installing the mold on the mold clamping plate, the ejecting pin and Connection with the protruding rod takes place automatically. In addition, since the connector 11 at the tip of the protruding rod is pushed into the annular groove 5 on the socket side by the locking member 10 to connect the two, it is possible to engage and disengage only by moving the locking member. Furthermore, since the connection is never released unless the locking member is removed, the two are always integral and never separate during the ejection operation of the molded product.

Therefore, the artificial connection of the ejecting device that accompanies mold replacement is omitted, and the mold can be replaced in a short time, thereby improving productivity.

[Brief explanation of drawings]

The drawings show one embodiment of the molded product ejecting device in a molding machine according to the present invention, in which Fig. 1 is a longitudinal sectional view when the mold is opened, Fig. 2 is a longitudinal sectional view when the ejecting pin is separated, and Fig. 3 is a longitudinal sectional view when the ejecting pin is separated. is a vertical cross-sectional view when coupled. 1...Mold clamping plate 2...Mold 4
...Protruding pin 5 ...Annular groove 6
...Socket 7 ...Protrusion rod 8 ...Hydraulic cylinder 9 ...Protrusion piston 11 ...Connector 12 ...
... Tapered hole 13 ... Engagement cylinder
lri...°°Lock piston (0 to 2h) Patent applicant: 1 person other than Nissei Jushi Kogyo Co., Ltd.

Claims (1)

[Claims] It consists of a protruding pin built into the mold, a protruding rod movably inserted into the clamping board, and a drive means on the clamping board that moves the protruding rod forward and backward. integrally connected in a socket provided at the rear part of the pin by engagement between an annular groove formed on the inner circumferential side of the socket and a connector provided on the distal end side of the protruding rod so as to be freely retractable;
A molded product ejecting device for a molding machine, wherein the connector is engaged and disengaged by a rod member that is installed in the ejecting rod and is movable in the axial direction.